Eric M. Kessler, Geza Giedke, Atac Imamoglu, Susanne F. Yelin, Mikhail D. Lukin, Juan I. Cirac
We investigate dissipative phase transitions in an open central spin system. In our model the central spin interacts coherently with surrounding many-particle spin environment and is subject to coherent driving and dissipation. We develop analytical tools based on a self-consistent Holstein-Primakoff approximation that enable us to determine the phase diagram associated with the steady states of this system. These include first and second-order phase transitions and s region of bistability, spin squeezing and altered spin pumping dynamics. Prospects of observing these phenomena in systems such as electron spins in quantum dots or NV centers coupled to lattice nuclear spins are briefly discussed.
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http://arxiv.org/abs/1205.3341
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